In Theory How Many Protons Could Be Pumped Under Standard

In theory how many protons could be pumped under standard state conditions by Complex III per mol of CoQ oxidized, considering the following information? (NOTE: mt = mitochondria)

A) four or less protons
B) greater than four protons but less than or equal to six protons
C) greater than six protons but less than or equal to eight protons
D) greater than 8 protons
E) Cannot be determined from the information provided.